其诱导保护性免疫的机制尚待进一步研究。
The mechanism of its inducing protective immunity needs to be studied further.
很多实验显示，这些颗粒可以诱发保护性免疫。
Several experiments showed that the particles could induce protective immunity.
感染后保护性免疫仅能持续数月，再感染经常发生。
Protective immunity against RSV infection after infection only last several months, so that reinfection often occurred.
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